GBRK,
Two things:
#1, at risk of coming to Bill's defense on anything, the pre-trib most certainly is supported by scripture. Just not by your interpretation of it.
I don't support that silliness either but there are many who claim it. Who am I to deny their belief? The definition of faith is, after all, belief in the absence of evidence.
#2 ANYTHING can be supported by scripture. Example: What does the bible have to say about abortion? Everyone claims this as a religious stance but I see an astounding lack of scriptural support for the notion.
Dale